Updating Nutrient Requirements for Rice-Based Cropping Systems in Non-Saline Tidal Flood Ecosystem of Bangladesh

P. K. SAHA1, M. N. ISLAM2* AND M. S. ISLAM3 1-Ex-Chief Scientific Officer, Soil Science Division, BRRI, Gazipur-1701, Bangladesh 2- Scientific Officer, Soil Science Division, BRRI, Gazipur-1701, Bangladesh 3-Agricultural Extension Officer, DAE, Bangladesh *Corresponding author email: [e-mail]   Received:12 May 2015                                                                           Accepted: 5 September 2015 ABSTRACT A number of crop problems can be related to inefficient management of nutrients and nutrient imbalances in the field. Appropriate fertilizer application is an important management practice to improve soil fertility and increase rice yield. Fertilizer should be applied based on a soil test and the desired yield. An experiment was conducted for four consecutive seasons: Boro (dry season) 2011-12 and Transplanted Aman (T. Aman, wet season) 2012 at the farmer’s field in Babuganj, Barisal (22.76˚ N and 90.30˚ E) to identify appropriate fertilizer management package for rice-based cropping systems in coastal non-saline tidal flood ecosystem in Bangladesh. In the present study, we examined the effects of eight fertilization treatments laid out in randomized complete block design with three replications. The treatment combinations were: T1 = 100% NPKSZn (STB), T2 = T1+25% N, T3 = T1+25% NP, T4 = T1+25% NK, T5 = T1+25% PK, T6 = T1+25% NPK, T7 = 75% of T1 and T8 = Absolute control. Results showed that application of different fertilizers significantly affected the grain yield at both of the seasons. In dry season, the highest grain yield was found in treatment T1 (100% STB) while T2 (T1+25% N) gave the highest grain yield in wet season. On the basis of yield performance, nutrient absorption and agronomic efficiency, it can be recommended that present fertilizer recommendation for dry season is enough while 25% additional N might be beneficial for wet season.    

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Keywords: AEZ-13 , cropping system , Nutrient uptake , Agronomic efficiency